Hydraulics full of water and mulitpower transmission

TimMiller · Jul 21, 2009

The hydraulics in my MF135 UK with multipower transmission is full of water. I am installing new shift boots and i'm going to drain the hydraulics. I was told to pull both drain plugs then fill her up with a few gallons of diesel and run her for a few minutes than drain her again, and check to see if most of the lovely white sludge is out. I'm going to definately replace the auxillary filter, but how do you change the filter thats on the hydraulic pump? I tried reading in the manual, but i must have some how missed that part. The closest thing i found was how to pull the hydraulic pump. Also since i have the multipower hydraulics is there more than one internal filter? Also what is a good way to test the multipower, i dont see any difference if the selector is in high or low.

DavidP,South Wales · Jul 21, 2009

Hello Tim,
Are we talking 'full' as in the casing being full or just a substantial two or three pints in the bottom of the transmission?
If the oil and water are mixed then hopefully not too much damage will have been done and certainly running it with diesel will help to flush out the sludge. There are several types of filter fitted depending on the age and serial number of the tractor. In general the filter is about the size of a cigarette packet and is mounted in front of the pump filter. To clean this filter you will probably have to split the tractor between the gearbox and centre casing to gain access to it. Removing the left hand side cover should make it visible. It may be possible to to blow at least part of it clear with an airline or can of WD40 or similar.
The HI/LO selector may not work due to the filter being blocked. If you have a filter mounted above the main fuel pump, don't forget to clean that as well.
DavidP

Tom from Buckeye Lake · Jul 21, 2009

Tim, I have a 150 with IPTO. It uses the same pump/filter as the Muti-power. I had to remove the lift cover to get to both filters. The Muti-power pump filter is easy to get out, however the three point pump filter was a SOB to get out, but can be done.

TimMiller · Jul 21, 2009

based on the dipstick i'm guessing there may be a gallon of water in it. Right now the dipstick shows the fluid being half way up the dipstick, a good 2-3 inches past the full line. It seems to be one thing after another with this tractor. But the good news is once its done its done.

TimMiller · Jul 21, 2009

Also since the tractor has been run for i dont know how long with the hydraulics full of water, is there a way to pressure test both pumps to make sure they are functioning properly. I know the pump that runs the hydraulics is good and strong but i dont know about the auxillary pump. Is there a port i can put a guage on it or something? The manual gets quite confusing with the more complex repairs (especially since i have the CD version) its a bunch of referencing back and forth.

DavidP,South Wales · Jul 21, 2009

Hi,
The level should be drained to the correct position as soon as possible. With it too high you risk oil passing the seals into the brake drums and into the clutch housing.
To check the MP Operating Pressure you will need a pressure gauge that will comfortably read a pressure of 200psi. You will also need adaptors and a pipe to 'T' the gauge into the front MP pipe where it comes up out of the transmission casing. With the gauge set up and the oil at operating temperature move the MP lever to 'high'.
At 2000 rpm you should have a pressure of not less than 190 psi. The needle should climb to this figure rapidly, not take its time.
To check the 3-pt pump attach a 4000 psi gauge to any of the pressure points on the cover (remotes, or trailer pipe if you have one) and again at 2000 engine revs you should have the following pressures.
On older tractors up to about 1970 (in the UK) the pressure was 2350 psi and from then on it was increased to 2550psi. Remember that these are only blow-off pressures and not flow figures which are more important when using a loader for example.

DavidP

Tom from Buckeye Lake · Jul 22, 2009

Tim, On my 150 there is a test port located on the left cover, where the PTO lever is located. However mine has Independent PTO. I don't really know just where to check the pressure on Muti-Power supplied tractors. I do know that you should have at least 180 psi and sometimes up to 320 psi on the Aux Pump, depending on how the tractor is set-up from the factory.

My manuals are with the tractor and are 620 miles south of here.

Hydraulics full of water and mulitpower transmission

TimMiller

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DavidP,South Wales

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Tom from Buckeye Lake

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TimMiller

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DavidP,South Wales

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